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Engineering Crossed Andreev Reflection in Double-Bilayer Graphene.

Geon-Hyoung Park1, Kenji Watanabe2, Takashi Taniguchi2

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We demonstrate efficient Crossed Andreev reflection (CAR) in a novel graphene device. This process enables tunable Cooper pair splitting for quantum entanglement applications.

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Cooper pair splittingCrossed Andreev reflectionbilayer graphenequantum entanglement

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science
  • Materials Science

Background:

  • Crossed Andreev reflection (CAR) is a fundamental quantum mechanical phenomenon.
  • CAR facilitates Cooper pair splitting, crucial for generating entangled electron pairs.
  • Previous studies faced challenges in achieving efficient and tunable CAR.

Purpose of the Study:

  • To fabricate and investigate efficient Crossed Andreev Reflection (CAR) in a vertically stacked double bilayer graphene (BLG) system.
  • To demonstrate the suppression of competing processes for enhanced CAR.
  • To explore the potential of this system for quantum entanglement applications.

Main Methods:

  • Fabrication of vertically stacked BLG structures with a superconducting electrode.
  • Utilizing nonlocal measurements to detect CAR.
  • Independently tuning the chemical potential of each BLG layer.
  • Analyzing the dependence of CAR signals on bias voltage, temperature, and chemical potential.

Main Results:

  • Achieved highly efficient CAR in BLG with a short spacing (∼14 nm) between layers.
  • Observed strong negative differential resistance, confirming efficient CAR.
  • Demonstrated effective suppression of competing processes by tuning chemical potentials.
  • Experimental results align with theoretical predictions for CAR.

Conclusions:

  • The developed BLG-SC device enables efficient and tunable CAR.
  • This system offers a promising platform for creating quantum entangled pairs.
  • The findings pave the way for novel superconducting quantum technologies.